Non-Isolated DC/DC Converter (POL) TSR 1SM Series, 1 A SMD-package Up to 96% efficiency No thermal layer required Built in filter capacitors Operation temp. range 40C to +85C The new TSR-1SM series models of step-down switching regulators have a Short circuit protection high efficiency up to 96% which allows full load operation up to +65C ambi- Wide input operating range ent temperature without the need of any heat transmission layer. Excellent out- put voltage accuracy (2%) and low standby current (~1 A) are features that Excellent line / load regulation distinguish these switching regulators from linear regulators. Low standby current 3-year product warranty Models Order Code Output Current Input Voltage Output Voltage Efficiency max. Range nom. typ. TSR 1-0512SM 1.2 VDC 91 % (at Vin min.) TSR 1-0515SM 3 - 5.5 VDC (5 VDC nom.) 1.5 VDC 92 % (at Vin min.) 93 % (at Vin min.) TSR 1-0518SM 1.8 VDC TSR 1-0525SM 3.8 - 5.5 VDC (5 VDC nom.) 2.5 VDC 95 % (at Vin min.) TSR 1-2412SM 1.2 VDC 74 % (at Vin min.) 1.5 VDC 79 % (at Vin min.) TSR 1-2415SM 4.6 - 36 VDC (12 VDC nom.) TSR 1-2418SM 1.8 VDC 82 % (at Vin min.) 1 000 mA TSR 1-2425SM 2.5 VDC 87 % (at Vin min.) TSR 1-2433SM 4.75 - 36 VDC (12 VDC nom.) 3.3 VDC 91 % (at Vin min.) TSR 1-2450SM 6.5 - 36 VDC (12 VDC nom.) 5 VDC 94 % (at Vin min.) TSR 1-2465SM 9 - 36 VDC (12 VDC nom.) 6.5 VDC 94 % (at Vin min.) TSR 1-2490SM 12 - 36 VDC (24 VDC nom.) 9 VDC 95 % (at Vin min.) TSR 1-24120SM 15 - 36 VDC (24 VDC nom.) 12 VDC 95 % (at Vin min.) TSR 1-24150SM 18 - 36 VDC (24 VDC nom.) 15 VDC 96 % (at Vin min.) Page 1 / 4 www.tracopower.com December 14, 2021TSR 1SM Series, 1 A Input Specifications Input Current - At no load 5 Vin models: 1 mA typ. 12 Vin models: 1 mA typ. 24 Vin models: 1 mA typ. - At full load 5 Vin models: 1 000 mA max. 12 Vin models: 1 000 mA max. 24 Vin models: 1 000 mA max. (at Vin min.) Reflected Ripple Current 150 mAp-p typ. Recommended Input Fuse 5 Vin models: 1 000 mA (slow blow) 24 Vin models: 1 600 mA (slow blow) - 12 Vin input 1.2 Vout models: 800 mA (slow blow) 1.5 Vout models: 800 mA (slow blow) 1.8 Vout models: 800 mA (slow blow) 2.5 Vout models: 1 250 mA (slow blow) 3.3 Vout models: 1 250 mA (slow blow) 5 Vout models: 1 250 mA (slow blow) 6.5 Vout models: 1 250 mA (slow blow) (The need of an external fuse has to be assessed in the final application.) Input Filter Internal Capacitor Output Specifications Voltage Set Accuracy 2% max. Regulation - Input Variation (Vmin - Vmax) 0.2% max. - Load Variation (0 - 100%) 0.6% max. Ripple and Noise 5 Vin models: 50 mVp-p typ. (20 MHz Bandwidth) 12 Vin models: 50 mVp-p typ. 24 Vin models: 75 mVp-p typ. Capacitive Load 470 F max. Minimum Load Not required Temperature Coefficient 0.015 %/K max. Start-up Time 5 ms typ. Short Circuit Protection Continuous, Automatic recovery Output Current Limitation 480% typ. of Iout max. (5 Vin models) 250% typ. (other models) Transient Response - Peak Variation 200 mV typ. / 400 mV max. (50% Load Step) - Response Time 250 s typ. / 350 s max. (50% Load Step) General Specifications Relative Humidity 95% max. (non condensing) Temperature Ranges - Operating Temperature 40C to +85C - Case Temperature +105C max. - Storage Temperature 55C to +125C Power Derating - High Temperature 2.5 %/K above 65C Over Temperature - Protection Mode 150C typ. (Automatic recovery) Protection Switch Off - Measurement Point Internal IC temperature Cooling System Natural convection (20 LFM) Switching Frequency 1200 kHz typ. (PWM) (5 Vin models) 500 kHz typ. (PWM) (other models) Insulation System Non-isolated Reliability - Calculated MTBF 12 000 000 h (MIL-HDBK-217F, ground benign) Moisture Sensitivity (MSL) Level 1 (J-STD-033C) All specifications valid at nominal voltage, resistive full load and +25C after warm-up time, unless otherwise stated. Page 2 / 4 www.tracopower.com December 14, 2021